code: def testMerge(self):
      basecomm = self.BASECOMM
      intercomm = self.INTERCOMM
      if basecomm.rank < basecomm.size // 2:
          high = False
      else:
          high = True
      intracomm = intercomm.Merge(high)
      self.assertEqual(intracomm.size, basecomm.size)
      self.assertEqual(intracomm.rank, basecomm.rank)
      intracomm.Free()
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 7 for calling the BaseTestIntercomm obj's underlying member method code with example usage: obj.testMerge() without return types